Deposit integrated in UI

[prayagd]

Description

Deposit assets from stellar to pendulum should also be available on the UI.

User Interface

• everything happens in one screen which is split in half
  • left half: Stellar side
  • right half: Pendulum side
• both screen halfes show the balances of the user in each chain
  • "the user" is a single account registered with the UI
  • the balances are updated in real time; no user interaction required
  • in Stellar:
    • the request to https://horizon-testnet.stellar.org/accounts/ returns all assets and their balances of the user
    • but hard to use for real time updates
    • so need to use streaming endpoints; can use stellar-sdk for this
      • might need to use the effects streaming
    • other strategy: use effect streaming endpoint and for every change poll the account information
    • other strategy: use createBalanceEmitter from our DTransfer code base
  • in Pendulum: this should already be in this code base because used in the other screens
• user interaction
  • deposit
    • parameters: stellar keypair (from stellar-sdk), asset, amount
    • should create a claimable balance and send to escrow account
  • withdraw
    • parameters: private key and seed of user (in Substrate format), asset, amount
    • our notion page describes how to initiate the withdrawal manually
    • this needs to happen automatically instead

Required logic

• function with callback that is called when Stellar balances change
• function with callback and asset that is called when Pendulum balances change (AP Torsten)
• function to execute deposit
• function to execute withdrawal